Hm, is this the expected behavior when you click on multiple locations on the map? Seems a little tricky...

To reproduce, I set my starting location to 145 Broadway and then clicked on the markers on the map. Clicking on any marker added directions, and clicking that marker twice removed the directions to that location, but clicking on other additional markers did not clear the original directions.

Pushing additional changes to the same feature branch will also get added to this PR, so you can make changes if you'd like. Otherwise if you don't think you can look into it by Tuesday, let me know and I can try to take a pass at it.